Renamed the commonly used Position POJO into AdvancedPosition, as it also hold pitch, yaw and roll

Made GuiDropdown only accept instances of GuiEntryListEntry to avoid unneccessary toString() methods returning the name
Added GuiEntryListValueEntry which holds a Value and a Name to be displayed
Continued work on GuiObjectManager

src/main/java/eu/crushedpixel/replaymod/holders/Transformations.java

@@ -1,20 +1,19 @@
 package eu.crushedpixel.replaymod.holders;
 
+import eu.crushedpixel.replaymod.interpolation.KeyframeList;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 
-import java.awt.*;
-
 @Data
 @AllArgsConstructor
 public class Transformations {
 
-    private Position anchor;
-    private Position position;
-    private Position orientation;
-    private Point scale;
-    private float opacity;
+    private KeyframeList<Position> anchorKeyframes, positionKeyframes,
+            orientationKeyframes, scaleKeyframes;
+    private KeyframeList<NumberValue> opacityKeyframes;
 
-    private float width, height;
+    public Transformation getTransformationForTimestamp(int timestamp) {
+        return null;
+    }
 
 }